Question: Who was the chairperson of FIDE as of 1-1-1949?
Paraphrase: Who was the chairperson of FIDE on January 1, 1949?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q102178 p:P488 ?s . ?s ps:P488 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1949')) }